TECHNICAL GUIDANCE

The ECPI approach has been adopted by the European Commission in their "Technical Guidance Document on the Risk Assessment of Notified New Substances" as the model for assessment of environmental exposure from additives in plastics. It is important to note, however, that due to the effect of ultraviolet degradation and microbial attack, a significant proportion of the emissions from flexible PVC consists of plasticizer degradation products. In these instances, therefore, the level of plasticizers appearing in the environment will be significantly less than indicated by the plasticizer loss data. 

Air/Superfund National Technical Guidance Study Series," Volume II "Estimation of Baseline Air Emission at Superfund Sites," EPA-450/l-89-002a, August 1990. Volume III "Estimation of Air Emissions from Clean-up Activities at Superfund Sites," EPA-450/1-89-003, January 1989. Volume IV "Procedures for Conducting Air Pathway Analyses for Superfund Applications," EPA-450/1-89-004, July 1989. 

The first part of this section is an edited version of Appendix K of the Technical Guidance for Hazards Analysis. This appendix is entitled "Evaluation Guide for Available Computer Applications Addressing Emergency Response Planning". (EPA document)... 

TECHNICAL GUIDANCE FOR HAZARDS ANALYSIS EVALUATION GUIDE FOR AVAILABLE COMPUTER APPLICATIONS ADDRESSING EMERGENCY RESPONSE PLANNING... 

Calculates the vulnerability zone based on the maximum quantity present for screening Calculations are based on credible worst case a.ssumptions identified in the Technical Guidance for Hazards Analvsis. 

Employs dispersion models that are consistent with those used in the Technical Guidance for Hazards Analysis ... 

The handbook additionally provides an extensive overview and comparison of commercially available computer systems and software for chemical emergency planning. This section provides technical guidance for hazard analysis and identification implementing regulatory requirements and descriptions of computer applications and systems applicable under SARA Title III. 

EPA, FEMA and DOT, 1987, Technical Guidance for Hazards Analysis, Emergency Planning for Extremely Hazardous Substances, December. 

Technical Guidance Document in Support of the Commission Directive 93/67/EEC on Risk. Assessment for New Notified Substances and the Commission Regulation (EC) 1488/94 on Risk Assessment for Existing Substances, European Commission, 1996. 

Site-specific modeiiing used the Technical Guidance Document (CEC, 2003) generic modelling used the BUSES model. 

Technical Guidance Document (CEC, 2003) calculations lead to significantly higher results than those derived using BUSES. This is mainly due to the assumption that local air emissions will enter the wastewater stream — which is not applied to the BUSES calculations. 

By comparison with the measured data presented above, it can be seen that the local PECs are generally below, or in the order of, the maximum values measured in the aquatic environment. By way of exception, the values reported for methyltins, and in particular dimeth-yltin dichloride, from stabilizer production using the Technical Guidance Document (CEC, 2003) equations are significantly higher than the maximum measured values reported in the environment. 

CEC (2003) Technical guidance document on risk assessment in support of Commission Directive 93/67/EEC on risk assessment for new notified substances and Commission Regulation (EC) No 1488/94 on risk assessment for existing... 

Environmental Protection Agency (EPA) Health Advisory— An estimate of acceptable drinking water levels for a chemical substance based on health effects information. A health advisory is not a legally enforceable federal standard, but serves as technical guidance to assist federal, state, and local officials. 

US Environmental Protection Agency, RCRA Ground-Water Monitoring Draft Technical Guidance, Office of Solid Waste, Washington, DC (1992). 

U.S. EPA, Technical Guidance Document Final Covers on Hazardous Waste Landfills and Surface Impoundments, EPA/530-SW-89-047, U.S. Environmental Protection Agency, Washington, DC, July 1991. 

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